塔身高、横担超长及刚度不均匀是±1 100 k V特高压直流输电线铁塔的显著特征,与普通高压输电塔相比,其"头重脚轻"现象更为严重,风荷载的作用效应及风振响应更加复杂。通过运用Davenport风速功率谱模拟大气边界层的脉动风...塔身高、横担超长及刚度不均匀是±1 100 k V特高压直流输电线铁塔的显著特征,与普通高压输电塔相比,其"头重脚轻"现象更为严重,风荷载的作用效应及风振响应更加复杂。通过运用Davenport风速功率谱模拟大气边界层的脉动风速,并考虑风荷载的空间相关特性,模拟分析B类场地43 m/s基本风速下该输电塔的风荷载时程;开展该铁塔风致响应的数值分析,研究其风振特点、顺风向风振系数计算方法及沿高度变化规律。基于风振响应分析可知:±1 100 k V特高压铁塔的风振系数沿高度并呈成线性分布,即在横担附近存在较大突变,与现有计算理论不相符;由于风振系数相关规范值忽略结构物外形、质量沿高度不均匀变化的影响,未能准确反映整塔风振系数沿高度的变化规律,且偏于不安全。展开更多
This paper aims to reduce the wind resistance of the self-designed offshore tourism platform by optimizing its superstructure,and a transparent shape design is finally suggested.A numerical simulation was performed to...This paper aims to reduce the wind resistance of the self-designed offshore tourism platform by optimizing its superstructure,and a transparent shape design is finally suggested.A numerical simulation was performed to calculate the wind load on the platform to test the effect of wind resistance reduction.Two original scale models(sealed and transparent)were established in accordance with the design requirements.The numerical simulation uses the FLUENT software combined with the built-in self-compiled user-defined function(UDF).The stochastic wind was also applied on the basis of the Davenport wind spectrum.The detached eddy simulation(DES)model was used to solve the NS equation.Numerical simulation results show that the wind resistance reduction for the transparent shape model is subtle in the horizontal direction but can effectively reduce the drag force and moment in the vertical direction.Moreover,the force variation of the transparent shape model under different wind attack angles decreases,which reduces the wind load fluctuations.展开更多
文摘塔身高、横担超长及刚度不均匀是±1 100 k V特高压直流输电线铁塔的显著特征,与普通高压输电塔相比,其"头重脚轻"现象更为严重,风荷载的作用效应及风振响应更加复杂。通过运用Davenport风速功率谱模拟大气边界层的脉动风速,并考虑风荷载的空间相关特性,模拟分析B类场地43 m/s基本风速下该输电塔的风荷载时程;开展该铁塔风致响应的数值分析,研究其风振特点、顺风向风振系数计算方法及沿高度变化规律。基于风振响应分析可知:±1 100 k V特高压铁塔的风振系数沿高度并呈成线性分布,即在横担附近存在较大突变,与现有计算理论不相符;由于风振系数相关规范值忽略结构物外形、质量沿高度不均匀变化的影响,未能准确反映整塔风振系数沿高度的变化规律,且偏于不安全。
基金Supported by the High-tech Ship Research Project of the Ministry of Industry and Information Technology(Grant No.2019[357]).
文摘This paper aims to reduce the wind resistance of the self-designed offshore tourism platform by optimizing its superstructure,and a transparent shape design is finally suggested.A numerical simulation was performed to calculate the wind load on the platform to test the effect of wind resistance reduction.Two original scale models(sealed and transparent)were established in accordance with the design requirements.The numerical simulation uses the FLUENT software combined with the built-in self-compiled user-defined function(UDF).The stochastic wind was also applied on the basis of the Davenport wind spectrum.The detached eddy simulation(DES)model was used to solve the NS equation.Numerical simulation results show that the wind resistance reduction for the transparent shape model is subtle in the horizontal direction but can effectively reduce the drag force and moment in the vertical direction.Moreover,the force variation of the transparent shape model under different wind attack angles decreases,which reduces the wind load fluctuations.
